package org.jeecg.common.util;

import javax.servlet.http.HttpServletRequest;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * IP地址 @Author scott
 *
 * @email jeecgos@163.com @Date 2019年01月14日
 */
public class IPUtils {
  private static Logger logger = LoggerFactory.getLogger(IPUtils.class);

  /**
   * 获取IP地址
   *
   * <p>使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
   * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
   */
  public static String getIpAddr(HttpServletRequest request) {
    String ip = null;
    try {
      ip = request.getHeader("x-forwarded-for");
      if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("Proxy-Client-IP");
      }
      if (StringUtils.isEmpty(ip) || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("WL-Proxy-Client-IP");
      }
      if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("HTTP_CLIENT_IP");
      }
      if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("HTTP_X_FORWARDED_FOR");
      }
      if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getRemoteAddr();
      }
    } catch (Exception e) {
      logger.error("IPUtils ERROR ", e);
    }

    //        //使用代理，则获取第一个IP地址
    //        if(StringUtils.isEmpty(ip) && ip.length() > 15) {
    //			if(ip.indexOf(",") > 0) {
    //				ip = ip.substring(0, ip.indexOf(","));
    //			}
    //		}

    return ip;
  }
}
